147 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 147 years old now, what year was he born? See below:

If 147 years old, year of birth is:
1877 or 1878*

*It depends on whether he was born before or after 1 January 1878.

If now 147 years and his year of birth 1877 if he was born after 19 December 1877 until 31 december 1877 inclusively, and his year of birth is 1878 if he was born from 1 January 1878 to 19 December 1878.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 14 years, year of birth 2010 or 2011
If now 21 years, year of birth 2003 or 2004
If now 56 years, year of birth 1968 or 1969

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